A scientist cut the tip off a shoot and placed the tip on a small block of agar for two hours. Auxin from the tip moved into the agar block.
The scientist then placed the agar block on the left-hand side of the cut top of a second shoot that had had its own tip removed.
The second shoot was kept in the dark.
Predict the direction in which the second shoot will bend.
Explain your prediction.
Explain why the second shoot was kept in the dark.
Describe a suitable control for this experiment.
105 exam-style questions on Edexcel GCSE Biology 6.3 Plant hormones, covering 6.3.1 Plant hormones and tropisms and 6.3.2 Commercial uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.